package com.wx.club.exception;

import cn.dev33.satoken.exception.SaTokenException;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.wx.club.entity.Result;
import org.springframework.boot.web.reactive.error.ErrorWebExceptionHandler;
import org.springframework.core.io.buffer.DataBufferFactory;
import org.springframework.http.MediaType;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

/**
 * 网关异常拦截器
 */
public class GatewayExceptionHandler implements ErrorWebExceptionHandler {
    private ObjectMapper objectMapper = new ObjectMapper();
    @Override
    public Mono<Void> handle(ServerWebExchange serverWebExchange, Throwable throwable) {

        ServerHttpResponse response = serverWebExchange.getResponse();
        Integer code = 200;
        String message = "";
        if (throwable instanceof SaTokenException) {
            code = 401;
            message = "用户无权限";
        }else {
            code = 500;
            message = "系统异常";
            throwable.printStackTrace();
        }
            Result result = Result.fail(code, message);
            response.getHeaders().setContentType(MediaType.APPLICATION_JSON);
            return response.writeWith(Mono.fromSupplier(() -> {
                DataBufferFactory dataBufferFactory = response.bufferFactory();
                byte[] bytes = null;
                try {
                    bytes = objectMapper.writeValueAsBytes(result);
                } catch (JsonProcessingException e) {
                    e.printStackTrace();
                }
                return dataBufferFactory.wrap(bytes);
            }));
        }

}
